/*
 * Copyright 2017 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#ifndef GrAHardwareBufferImageGenerator_DEFINED
#define GrAHardwareBufferImageGenerator_DEFINED

#include "include/private/gpu/ganesh/GrTextureGenerator.h"
#include "include/private/gpu/ganesh/GrTypesPriv.h"

class GrGpuResource;
class GrSurfaceProxyView;

extern "C" {
typedef struct AHardwareBuffer AHardwareBuffer;
}

/* *
 * GrAHardwareBufferImageGenerator allows to create an SkImage attached to
 * an existing android native hardware buffer. A hardware buffer has to be
 * created with AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE usage, because it is
 * bound to an external texture using an EGLImage. The image generator will
 * keep a reference to the hardware buffer for its lifetime. A hardware buffer
 * can be shared between processes and same buffer can be used in multiple GPU
 * contexts.
 * To implement certain features like tiling, Skia may copy the texture to
 * avoid OpenGL API limitations.
 */
class GrAHardwareBufferImageGenerator : public GrTextureGenerator {
public:
    static std::unique_ptr<SkImageGenerator> Make(AHardwareBuffer *, SkAlphaType, sk_sp<SkColorSpace>, GrSurfaceOrigin);

    ~GrAHardwareBufferImageGenerator() override;

    static void DeleteGLTexture(void *ctx);

private:
    GrAHardwareBufferImageGenerator(const SkImageInfo &, AHardwareBuffer *, SkAlphaType, bool isProtectedContent,
        uint32_t bufferFormat, GrSurfaceOrigin surfaceOrigin);

    bool onIsValid(GrRecordingContext *) const override;

    GrSurfaceProxyView onGenerateTexture(GrRecordingContext *, const SkImageInfo &, skgpu::Mipmapped,
        GrImageTexGenPolicy) override;

    GrSurfaceOrigin origin() const override
    {
        return fSurfaceOrigin;
    }

    GrSurfaceProxyView makeView(GrRecordingContext *context);

    void releaseTextureRef();

    static void ReleaseRefHelper_TextureReleaseProc(void *ctx);

    AHardwareBuffer *fHardwareBuffer;
    uint32_t fBufferFormat;
    const bool fIsProtectedContent;
    GrSurfaceOrigin fSurfaceOrigin;
};
#endif // GrAHardwareBufferImageGenerator_DEFINED
